Metal staircase.



INo. 847,699. PATENTED MAR. 19,' 1907 P. SCHERBNER..

METAL STAIRGASE.

APPLICATION FILED JULY 21, 1906.

. form the main support for the staircase, and

l proof material being preferred in place of of stone from the effects of. heat from below,

UNiTED STATES PATENT opinen.

PAUL SCHERBNER, OFI NEW YORK, N. Y. l

METAL sTAiRoASE.

York, have invented certain new and useful Improvements in Metal. Staircases, of which the following is a specification. v n This invention relates to improvementsl in metal staircases andthe *objectof my invention is to simplify. the construction, reducethe cost, and enhance the appearance of the staircase. Y I

-In the accompanying drawin s, in which like letters of reference indicate Iike arts in all the figures, Figure 1 is a vertical ongitu' dinal elevation through part yof my improved staircase. Fi g; 2 is a similar view of a modi-` fied construction. p

Metal staircases are usually constructed with metal stringere or sidepieces A, which to said side pieces pieces of angle-iron B are riveted at intervals to form the `sup orts for the steps which rest upon these ange-irons. The steps or treads C are made of Wood, slate, marble, composition, &e. usually of a firewood. For. the Apurpose of protecting the treads or 'steps both When made of Wood or so as to prevent their crackin and breakin orbecoming ignited the bui ding laws an the insurance underwriters require that a sheet metal be placed underneath the treads C and upon the -iron angle-irons B. The risers D of the steps are also made of sheet metal. IIn my improved staircase I make a riser D and a horizontal sheet--metal portion E, upon which the tread roper, C, restsA integral of a single piece of s eet metal, which is bent at right angle and of such dimension that one side of the shank of the angle forms the riser D and the other the tread portion E. Asshown in Fig. 1, I provide a flange F along the baseof the riser ortion D, which flange F extends horizontal y in the opposite direction of the tread portion E on the same riser," so that when the staircase is built up the free rear edge ofveach treadportion E Specification of- Letters Patent. Application med July 21,1906. serial No. 327.143.

rests upon the upper surface of the flange F of the next higher riser D. Small bolts G or i Patented Marchio, 19o?.

rivets are passed through said overlapping parts vot the sheet metal of the tread portlons E and flanges F.

As shown in Fig. 2, the riser portion D is also made integral with its corresponding tread portion and bent up from sheet metal;

but `at the top of each riser portion the upper part of the riser of sheet metal is curved to the front to forma cove I-I and a nosin J above it, and likewise at thel bottom of t e riser` ortion the metalis curved in the opposite irection to forma cove H and a nosing J, the flange F projecting from the bottom portion of the. nosing H. v'Ihe free edge of each tread portion rests upon the iange F of the next higher riser ortionin the same manner as described in lre atiOmtOFig. 1, and the parts are also bolted together. The nosings and coves formed onthe front side of the riser at the top and the rearfs'ide ofthe riser at the bottomimprove the a pearance of the staircase, but serve main y for the 4purpose of stiffening the combined riser and tread portion, and thusincreasing its strength.

Having described my invention, what I claim as new, .and vdesire to secure by Letters Patent, is--4 1. In a metal staircase, the combination of a series of risers and treads, eachriser being made integral out of sheet metal with one tread and each riser being provided along its lbottom with a ange and each riser being provided at'the bottom with a curve forming a nosing and cove,.substantially as set forth.

2. In a metal staircase, the combination of a series of risers and treads, each riser being made integral out of sheet metal with one tread and each riser being provided along its bottom with a lange and each riser being provided at the .topwith a curve lforminga nosing and cove on thefront ofthe riser, and

each riser being alsoprovided at the bottom with a4 curve forming a nosing and cove on the-back of the riser, substantially as set forth.

Signed at New York city, in the county of New York and State of New York, this 11th day oi July, A. D. 1906.

` PAUL SCHERBNER.

VVitnessesr y 4 W. S. STEWART',- G. A. McMUNN. 

